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KVM: x86/mmu: Allow yielding during MMU notifier unmap/zap, if possible

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Let the TDP MMU yield when unmapping a range in response to a MMU
notification, if yielding is allowed by said notification.  There is no
reason to disallow yielding in this case, and in theory the range being
invalidated could be quite large.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210402005658.3024832-11-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-04-01 17:56:58 -07:00 committed by Paolo Bonzini
parent 8931a454ae
commit e1eed5847b
1 changed files with 5 additions and 1 deletions
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6
arch/x86/kvm/mmu/tdp_mmu.c
View file

@ -880,7 +880,7 @@ bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
for_each_tdp_mmu_root(kvm, root, range->slot->as_id)
flush |= zap_gfn_range(kvm, root, range->start, range->end,
false, flush);
range->may_block, flush);
return flush;
}
@ -898,6 +898,10 @@ static __always_inline bool kvm_tdp_mmu_handle_gfn(struct kvm *kvm,
rcu_read_lock();
/*
* Don't support rescheduling, none of the MMU notifiers that funnel
* into this helper allow blocking; it'd be dead, wasteful code.
*/
for_each_tdp_mmu_root(kvm, root, range->slot->as_id) {
tdp_root_for_each_leaf_pte(iter, root, range->start, range->end)
ret |= handler(kvm, &iter, range);